Re: [Intel-gfx] [PATCH] Revert "drm/i915/hwmon: Enable PL1 power limit"

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Wed, Feb 08, 2023 at 11:03:12AM -0800, Ashutosh Dixit wrote:
> This reverts commit 0349c41b05968befaffa5fbb7e73d0ee6004f610.
> 
> 0349c41b0596 ("drm/i915/hwmon: Enable PL1 power limit") is incorrect and
> caused a major regression on ATSM. The change enabled the PL1 power limit
> but FW sets the default value of the PL1 limit to 0 which implies HW now
> works at minimum power and therefore the lowest effective frequency. This
> means all workloads now run slower resulting in even GuC FW load operations
> timing out, rendering ATSM unusable.
> 
> A different solution to the original issue of the PL1 limit being disabled
> on ATSM is needed but till that is developed, revert 0349c41b0596.
> 
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8062

pushed to drm-intel-next and removed from drm-intel-fixes.

Thanks for the quick reaction.

> Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_hwmon.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c
> index 4683a5b96eff1..1225bc432f0d5 100644
> --- a/drivers/gpu/drm/i915/i915_hwmon.c
> +++ b/drivers/gpu/drm/i915/i915_hwmon.c
> @@ -687,11 +687,6 @@ hwm_get_preregistration_info(struct drm_i915_private *i915)
>  		for_each_gt(gt, i915, i)
>  			hwm_energy(&hwmon->ddat_gt[i], &energy);
>  	}
> -
> -	/* Enable PL1 power limit */
> -	if (i915_mmio_reg_valid(hwmon->rg.pkg_rapl_limit))
> -		hwm_locked_with_pm_intel_uncore_rmw(ddat, hwmon->rg.pkg_rapl_limit,
> -						    PKG_PWR_LIM_1_EN, PKG_PWR_LIM_1_EN);
>  }
>  
>  void i915_hwmon_register(struct drm_i915_private *i915)
> -- 
> 2.38.0
>